The two versions of the Aaberg exhaust system, namely an axisymmetri-cal version and a workbench version, both work on the same principle. In order to illustrate the principle of the Aaberg we describe the axisymmetrical version but the full theoretical, computational, and experimental basis is presented for both systems. [Pg.956]

FIGURE 10.79 Typical streamlines for the flow near the exhaust hood when there is (o) only suction. (b) some exhaust Bow, and (cl a large exhaust flow. (The flow is symmetrical about X = 0.) The shaded area represents the predicted effective capture region. [Pg.958]

FIGURE 10.80 A typical Aaberg ventilator unit. v hich is suspended above the floor white smoke is released on the floor beneath the venciiator. [Pg.959]

Finaliy, the same principle as described above applies to the bench version of the Aaberg principle, which we discuss in detail in the next section, [Pg.960]

Plane jets could be used to create a closed volume in which a contaminant source could be placed. In some ways, these systems are similar to Aaberg exhaust hoods (Section 10.4.4). The objective is to use plane jets instead of walls around an exhaust opening to create a vortex which enhances the capture efficiency of the exhaust. [Pg.1007]